Jaw motion tracking system and operating method using the same

Abstract

In this invention, a high-accuracy jaw motion tracking system and method using the same are disclosed. The jaw motion tracking system of the invention mainly comprises an eyewear facebow static positioning device, a lower jaw dynamic tracking device and a stereo-vision charge-coupled device (CCD) and can provide information regarding the locations and relative movement of lower and upper jaws. The eyewear facebow static positioning device has several passive and active reflective markers. The lower jaw dynamic tracking device equips with a plural of lightweight light emitting devices. Using OpenCV-based self-developed algorithm and post-iterative compensator, the disclosed system can record the dynamical jaw movement with a high accuracy. The disclosed jaw motion tracking system and related method have minimal occlusal disturbance and provide smooth motion-tracking performance. The disclosed system can be used in clinical dentistry.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]The present invention generally relates to a jaw motion tracking system, and more particularly a high-accuracy jaw motion tracking system and operating method using the same, with a light weight and a minimal occlusal disturbance.Description of the Related Art[0002]Jaw movements include opening and closing, protrusion, retrusion and lateral excursion of the mandible. Dentists use articulators to reduplicate the oral structures of the patient, and design and fabricate the dental prosthesis based on the model on the articulator. The components of the conventional articulator system include a facebow, which transfers the position of the temporo-mandibular joint and a bite record that registrants the maxilla-mandibular relationship. However, the jaw movement could not be perfectly recorded using an articulator.[0003]The evolutions of facebow transfer are from arbitrary facebow, kinematic facebow to virtual facebow. (1) Arbitrary fac...

AI Technical Summary

Benefits of technology

[0011]It is an objective of the present invention to provide a high-accuracy and light-weight jaw motion tracking system having minimal occlusal disturbance and providing smooth motion-tracking performance.

[0017]It is another objective of the present invention to provide a high-accuracy operating method of the jaw motion tracking system having minimal occlusal disturbance and providing smooth motion-tracking performance.

Problems solved by technology

However, the jaw movement could not be perfectly recorded using an articulator.

However, mandible movement contains six degree of freedom, thus arbitrary facebow and bite registration cannot represent the actual masticatory function of the patients.

Although the system is claimed with a accuracy less than 100 μm nowadays, it is too large and heavy that might interfere the movement of the patient as a result.

However, the transmitters of the instruments mentioned above are also too bulky and complicated.

Ultrasonic-based jaw motion tracking devices and other developing optoelectronic devices of the prior art are typically heavy and may cause occlusal interference.

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